Absorption of carbon dioxide from a carbon dioxide–air mixture in a solution containing 100 kg/m3 of caustic soda, using

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Absorption of carbon dioxide from a carbon dioxide–air mixture
in a solution containing 100 kg/m3 of caustic soda, using a 250 mm
diameter tower packed to a height of 2 m with 19 mm Raschig rings.
The results obtained at atmospheric pressure 1013hPa, and gas rate
is 0.4 kg/m2s, and liquid rate is 5.0 kg/m2s. The carbon dioxide in
the inlet gas was 850 parts per million and the carbon dioxide in
the exit gas was 65 parts per million. The equilibrium can be
described by the relation y1e =1.6x1. What is the value of the
overall gas transfer coefficient KGa in kmol/m3s·kPa? Calculate
height and number of transfer units